Qt5 C++ GUI Programming Cookbook

Using easing curves to control property animation

In this example, we will learn how to make our animation more interesting by utilizing easing curves. We will still use the previous source code, which uses the property animation to animate a push button.

How to do it…

1. Define an easing curve and add it to the property animation before calling the start() function:

   QPropertyAnimation *animation = new QPropertyAnimation(ui->pushButton, "geometry");
   animation->setDuration(3000);
   animation->setStartValue(ui->pushButton->geometry());
   animation->setEndValue(QRect(200, 200, 100, 50));
   QEasingCurve curve;
   curve.setType(QEasingCurve::OutBounce);
   animation->setEasingCurve(curve);
   animation->start();

2. Call the setLoopCount() function to set how many loops you ...